高温度に於ける鋼並に鑄鐵の熱的傳導率測定と青熱脆性に就て
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概要
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Some physical properties such as thermal conductivity, expansion, and drop-shock hardness are measured up to 700℃ for some metals given below and their heat capacity, true specific heat were obtained from the results measured above. The metals tested are : (1) seven kinds of carbon steel of 0.04%C to 0.88%C (2) 3-grey and 4-white cast irons (3) a common brass of 70% copper and 30% zinc. Both the thermal and temperature conductivity were obtained in each measurement by heating sine periodically on one side of each specimen, quite different in heating manner of specimen from the previous way used for measuring the thermal conductivity. It has been further provel that both thermal and temperature conductivity of metal are measured more precisely by the periodic way than usual direct-heat-flow system hethertofore generally used. For the measuring of expansion, two micro-telescopes with 1/100mm reading scale in eye-piece were used, and for the hardness at high temperatures the Martell's system constructed in our laboratory spplied. From these measurements and their following results, a certain deviation or anormality covering a certain specified temperature for each metal, is found to exist commonly in all properties measured above. The temperature of such a maximum deviation has been proved to exist in 300℃∿330 for steel, 350℃ for both cast iron and brass. Further, it has been seen that the reduction of the sum of space among the grains of metal due to the expansion by heat is to be the direct cause of the Blue-Shortness of each metal, and all the other anormality is only as its secondary effect.
- 1936-06-25
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